输电线路超耐热铝合金导线抗拉强度估计方法

Estimation Method of Tensile Strength of Ultra-heat-resistant Aluminum Alloy Conductors for Transmission Lines

输电线路中运行的导线在长期使用中易出现断裂等问题,为了准确判断导线的强度,提出输电线路超耐热铝合金导线的抗拉强度估计方法。以连接相邻球单元作为坐标系,通过获取导线运动规划力学参数、自由度空间向量以及应变分量等,完成输电线路超耐热铝合金导线的力学分析;利用强度软化、刚度退化技术以及GDA有限元积分计算,构建输电线路超耐热铝合金导线有限元模型;通过屈服响应特征获取导线惯性参量,拟合导线边界处节点上力学参数;获取导线受力分量以及耦合强度关系,确定导线抗拉结构强度值,实现铝合金导线抗拉强度估计。仿真结果表明,采用本文方法对输电线路超耐热铝合金导线抗拉强度估计的误差最低约为0.2%,且估计速度较快。

In order to accurately judge the strength of the conductor,a method is proposed to estimate the tensile strength of the super heat resistant aluminum alloy conductor.Taking the adjacent spherical elements as the coordinate system,the mechanical analysis of transmission line super heat resistant aluminum alloy conductor is completed by obtaining the mechanical parameters of conductor motion planning,space vector of degree of freedom and strain component;the finite element model of transmission line super heat resistant aluminum alloy conductor is constructed by using strength softening,stiffness degradation technology and GDA finite element integral calculation;and the yield response characteristics are analyzed the inertia parameters of the conductor are obtained to fit the mechanical parameters on the nodes at the boundary of the conductor;the stress components and coupling strength relationship of the conductor are obtained to determine the tensile strength value of the conductor,so as to realize the estimation of the tensile strength of the aluminum alloy conductor.The simulation results show that the minimum error of this method is about 0.2%,and the estimation speed is fast.